Adaptive variable gauge system for maintenance of navigable tunnel

Abstract

The present application relates to the field of water conservancy construction maintenance equipment, in particular to a kind of navigable tunnel maintenance adaptive variable gauge system.It is suitable for the maintenance of navigable tunnel in linear, circular arc and gauge variation section.The system includes a maintenance door machine across the waterway, a laterally adjustable leg assembly, a lower traveling mechanism, an auxiliary upper traveling mechanism, a gauge adjustment mechanism, a leg locking mechanism and a control system.The leg spacing is adjusted by the gauge adjustment mechanism, the auxiliary traveling mechanism and the upper support form a temporary load path, so that the lower traveling mechanism is separated from the track to complete load switching and gauge adjustment.In the circular arc section, the auxiliary traveling mechanism is differentially driven to realize the steering operation of the door machine.The system can realize continuous maintenance of the whole tunnel, improve the adaptability and operation efficiency of the equipment.

Description

Technical Field

[0001] This invention relates to the field of hydraulic engineering maintenance equipment, and more specifically to an adaptive variable gauge system for the maintenance of navigation tunnels. Background Technology

[0002] A navigation tunnel is a hydraulic structure designed to allow ships to pass through. It creates a closed waterway within mountains, underground, or other special areas, enabling ships to navigate across regions. Compared to traditional navigation channels or locks, navigation tunnels have advantages such as smaller footprint, lower impact on the surface environment, and the ability to avoid ecologically sensitive areas and complex terrain conditions. Therefore, they are increasingly widely used in modern waterway engineering construction.

[0003] To ensure the long-term safe operation of navigation tunnels, regular inspections and maintenance of the tunnel's internal structure, waterway facilities, and auxiliary equipment are necessary. Since navigation tunnels typically have a track system for maintenance equipment, gantry cranes can be used to move longitudinally along the tunnel during maintenance operations. Suspended inspection devices, dredging devices, salvage devices, and maintenance platforms are used to work on the waterway and tunnel structure. Most existing maintenance gantry cranes use a fixed leg structure, with the left and right legs running along tracks on maintenance platforms on both sides of the waterway. The leg spacing and track spacing are fixed values, therefore they are only suitable for straight navigation tunnels with a constant track gauge.

[0004] However, in actual engineering construction, due to factors such as terrain conditions, route planning, navigation requirements, and engineering layout, navigation tunnels are not all straight structures with a constant track gauge. In some navigation tunnels, to meet the turning requirements, circular arc sections, curved sections, or oblique sections are included; there may also be variations in channel width in the tunnel entrance / exit areas and between different functional sections. As the channel width changes, the track spacing on the maintenance platforms on both sides of the channel will also change accordingly. For example, in the circular arc section area, to ensure the ship's turning ability, the channel width is usually appropriately increased, resulting in a larger track spacing on both sides compared to the straight section; the track spacing may also change in the transition area between different cross-sections.

[0005] For navigation tunnels with curved sections, skew sections, or track gauge changes, traditional fixed-gauge maintenance gantry cranes cannot adapt to continuous transitions between different track gauge sections because the leg spacing is not adjustable. When the gantry crane reaches a track gauge change area, it is difficult for its legs to maintain a normal fit with the track, thus preventing further operation. Furthermore, since existing gantry cranes mainly rely on their bottom traveling mechanism to move along the track, they lack auxiliary guidance and load-bearing structures suitable for curved sections, making continuous passage through arc sections or turning sections difficult.

[0006] To address these issues, current engineering practices typically employ methods such as segmented maintenance, equipment disassembly and relocation, or the deployment of dedicated maintenance equipment for different sections. However, these methods not only increase the number of equipment and engineering investment costs but also reduce maintenance efficiency and increase the difficulty of maintenance management, making it difficult to meet the full-range continuous maintenance requirements of complex-shaped navigation tunnels.

[0007] Therefore, how to provide a navigation tunnel maintenance system that can adapt to different track gauge sections, operate continuously in curved or turning sections, and automatically switch between different track gauges has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] To address the limitations of existing navigation tunnel maintenance equipment, which is only suitable for fixed-gauge straight navigation tunnels and struggles to perform continuous maintenance on curved, skewed, and gauge-variable sections, this invention provides an adaptive variable gauge system for navigation tunnel maintenance. This system, by incorporating adjustable gauge outriggers on the maintenance gantry crane, along with an upper support structure and auxiliary walking mechanism mounted on the tunnel sidewall, enables automatic switching and continuous operation of the maintenance gantry crane across different gauge sections, thus meeting the full range of maintenance needs for complex-shaped navigation tunnels.

[0009] To achieve the above objectives, the present invention provides an adaptive variable gauge system for maintenance of navigation tunnels, comprising: The navigation tunnel body forms a waterway for ships to pass through, and maintenance platforms are set on both sides of the waterway; Two sets of lower travel tracks are respectively installed on the maintenance platform; The maintenance gantry crane is spanned above the waterway and includes a main beam, outrigger assemblies on both sides of the main beam, and a lower traveling mechanism that cooperates with the outrigger assemblies. The lower traveling mechanism cooperates with a lower traveling track to drive the maintenance gantry crane to move along the extension direction of the navigation tunnel. The outrigger assemblies are laterally movably mounted on the main beam, and the main beam is provided with a gauge adjustment mechanism for driving the outrigger assemblies to move along the width direction of the main beam, so as to adjust the distance between the two sets of outrigger assemblies. The upper part of the side wall of the navigation tunnel body is provided with an upper support structure, and the upper part of the maintenance gantry crane is provided with an auxiliary walking mechanism that cooperates with the upper support structure. The auxiliary walking mechanism is configured to cooperate with the upper support structure and carry the maintenance gantry crane during track gauge adjustment, so that the lower walking mechanism is disengaged from the lower walking track to allow the outrigger assembly to be adjusted in position. The track gauge adjustment mechanism is used to adjust the position of the outrigger assembly on the main beam and lock the distance between the two outriggers, so that the maintenance gantry crane can adapt to the operating requirements of different track gauge sections.

[0010] In some embodiments, the upper support structure is disposed in at least one region of the arc section, skew section, and track gauge change section of the navigation tunnel, and is continuously arranged along the extension direction of the corresponding region.

[0011] In some embodiments, the upper support structure includes support brackets disposed on the upper part of the side walls on both sides of the navigation tunnel, the support brackets forming a support surface or guide track for the auxiliary walking mechanism to travel on.

[0012] In some embodiments, the auxiliary walking mechanism includes auxiliary walking wheel sets disposed at both ends of the main beam, the auxiliary walking wheel sets being connected to a drive device to drive the maintenance gantry crane to move along the upper support structure; The auxiliary walking wheel set can be rotated relative to the main beam to adapt to changes in the direction of travel in the arc segment or turning segment.

[0013] In some embodiments, the track gauge adjustment mechanism includes a transverse track and a support leg moving trolley disposed on the transverse track. The support leg assembly is mounted on the support leg moving trolley, and the support leg moving trolley moves along the transverse track to drive the support leg assembly to adjust its position. The track gauge adjustment mechanism also includes a drive assembly, which is one of a gear and rack mechanism, a lead screw and nut mechanism, a chain drive mechanism, or a hydraulic drive mechanism. In some embodiments, a leg locking mechanism is provided on the main beam. After the leg assembly moves to the target gauge position, the leg locking mechanism locks the leg assembly onto the main beam. The outrigger locking mechanism includes one of a locking pin assembly, a wedge block assembly, a hydraulic locking assembly, or a mechanical clamping assembly.

[0014] In some embodiments, the outrigger trolley is provided with a load-bearing support mechanism. After the outrigger assembly is positioned, the load-bearing support mechanism extends and forms a support cooperation with the main beam to transfer the load borne by the outrigger assembly to the main beam, thereby reducing the load on the wheels of the outrigger trolley.

[0015] In some embodiments, the auxiliary walking mechanism is provided with a lifting drive assembly, which drives the auxiliary walking mechanism to extend upward and abut against the upper support structure, so as to lift the maintenance gantry crane to a state where the lower walking mechanism is disengaged from the lower walking track.

[0016] In some embodiments, a height transition structure is provided between the upper support structure and the lower travel track. The height transition structure is used to change the distance between the upper support structure and the lower travel track, so as to realize the switching of the maintenance gate machine between the lower travel mechanism load state and the auxiliary travel mechanism load state. The height transition structure includes a track ramp structure installed on the lower running track and / or a support ramp structure installed on the upper support structure.

[0017] In some embodiments, the system further includes a control system connected to the gauge adjustment mechanism, the auxiliary walking mechanism, and the lower walking mechanism, for controlling the adjustment of the outrigger assembly position, the switching of the load-bearing state, and the maintenance of the gantry crane operation.

[0018] An adaptive variable gauge system for navigation tunnel maintenance, applying the above-mentioned technical solution of the present invention, has the following effects: Compared with existing technologies, the adaptive variable gauge system for navigation tunnel maintenance provided by this invention integrates the navigation tunnel structure with the maintenance gantry crane structure through collaborative design. By coordinating the lower traveling track system, upper support structure, auxiliary traveling mechanism, adjustable gauge outrigger assembly, and gauge adjustment mechanism, a continuous maintenance system capable of adapting to different gauge sections, curved sections, and turning sections is constructed. This system not only meets the routine maintenance needs of straight navigation tunnels but also enables continuous passage and automatic adaptation of equipment in gauge-changing and circular turning areas. It fundamentally solves the problem that traditional fixed-gauge maintenance gantry cranes cannot adapt to complex navigation tunnel alignments, achieving full-range, continuous maintenance of complex navigation tunnels, significantly improving maintenance efficiency, and reducing equipment configuration and maintenance costs.

[0019] Specifically: This invention, by incorporating laterally movable outrigger assemblies and a track gauge adjustment mechanism, allows the outrigger spacing to be adjusted according to the track gauge of the target section when the maintenance gantry crane operates in a track gauge variation zone. This ensures that the track gauge of the maintenance gantry crane matches the lower traveling track of the corresponding section. Compared to traditional fixed-gauge structures, this invention can adapt to the track gauge variation requirements of navigation tunnels of different widths, enabling the same maintenance equipment to cover multiple track gauge sections and improving equipment utilization.

[0020] This invention, by setting up an upper support structure and an auxiliary traveling mechanism, forms an auxiliary load-bearing path independent of the lower track system during track gauge adjustment. When the auxiliary traveling mechanism cooperates with the upper support structure, it can bear the weight of the entire maintenance gantry crane, allowing the lower traveling mechanism to detach from the track. This removes the track's constraint on the outrigger position, creating conditions for lateral adjustment of the outrigger assembly. This structure ensures stable support during track gauge adjustment, improving the safety and reliability of the track-changing process.

[0021] Under normal maintenance conditions, the lower traveling mechanism runs along the track; under track gauge change or turning conditions, the auxiliary traveling mechanism runs along the upper support structure and bears the equipment load, realizing the switching between the two traveling systems. Through the coordinated operation of the two traveling systems, the maintenance gantry crane can smoothly switch between different operating conditions and complete cross-section operation without disassembling the equipment.

[0022] The auxiliary traveling mechanism not only serves as a temporary load-bearing component but also guides the gantry crane along the upper support structure installed on the sidewall of the navigation tunnel. When the navigation tunnel has curved or turning sections, the auxiliary traveling mechanism can drive the entire maintenance gantry crane to complete the turning operation according to the curved path, enabling the maintenance gantry crane to pass through curved sections, thus breaking through the limitation of traditional gantry maintenance equipment that can only run along straight tracks.

[0023] The upper support structure in this invention can be arranged in special areas such as circular arc sections, gauge variation sections, and skew sections according to the actual alignment of the navigation tunnel. Automatic load switching between the auxiliary and lower traveling mechanisms can be achieved through a height transition structure. The entire switching process is simple in structure and runs smoothly, effectively reducing the degree of manual intervention and improving the system's automation level and operational reliability.

[0024] In summary, this invention organically combines an adjustable gauge maintenance gantry crane with a special support structure for navigation tunnels, establishing a maintenance and operation system suitable for complex linear navigation tunnels. It enables continuous operation of maintenance equipment in different gauge sections and curved sections, and has advantages such as strong adaptability, good operational continuity, wide maintenance range, high safety and reliability, and high engineering application value.

[0025] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the adaptive variable gauge system of the present invention operating in a straight section; Figure 2 This is a schematic diagram of the adaptive gauge system of the present invention before gauge change in a circular arc segment. Figure 3 This is a schematic diagram of the operating state of the adaptive gauge system of the present invention after gauge change in a circular arc segment; Figure 4 This is a schematic diagram of the adaptive variable gauge system of the present invention operating in another straight segment; Figure 5 This is a schematic diagram of a highly transitional structure.

[0027] Explanation of reference numerals in the attached figures 1-Navigation tunnel body; 1a-Waterway; 1b-Maintenance platform; 1c-Lower travel track; 1d-Upper support structure; 1e-Height transition structure; 2-Maintenance gantry crane; 2a-Main beam; 2b-Outrigger assembly; 2c-Lower traveling mechanism; 2d-Auxiliary traveling mechanism. Detailed Implementation

[0028] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0029] In this invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the orientation in the assembled and used state. "Inner" and "outer" refer to the inner and outer sides relative to the outline of each component itself.

[0030] I. Adaptive Variable Gauge System for Navigation Tunnel Maintenance This embodiment discloses an adaptive variable gauge system for navigation tunnel maintenance, which is applicable to navigation tunnels with gauge variation sections, circular arc sections, skew sections, or combinations of the above sections, and is used to realize continuous maintenance operations throughout the entire navigation tunnel area.

[0031] The system includes a navigation tunnel body 1, two sets of lower traveling tracks 1c installed inside the navigation tunnel body 1, an upper support structure 1d installed on the upper part of the side wall of the navigation tunnel, a maintenance gantry crane 2, and a control system.

[0032] The navigation tunnel 1 has a channel 1a for ships to pass through inside. Maintenance platforms 1b are set on both sides of the channel 1a. Two sets of lower walking tracks 1c are set on the corresponding maintenance platforms 1b to provide routine operation support for the maintenance gantry crane 2.

[0033] The upper support structure 1d is located in the upper area of ​​the sidewalls on both sides of the navigation tunnel, preferably in special sections such as arc sections, gauge change sections, and skew sections, and is continuously arranged along the extension direction of the corresponding section. The upper support structure 1d is used to form an auxiliary load-bearing path and a guiding path when the maintenance gantry crane 2 is adjusting the gauge or turning.

[0034] The maintenance gantry crane 2 spans above the channel 1a and includes a main beam 2a, outrigger assemblies 2b on both sides of the main beam 2a, a lower traveling mechanism 2c at the bottom of the outrigger assembly 2b, a track gauge adjustment mechanism, an outrigger locking mechanism, a load-bearing support mechanism and an auxiliary traveling mechanism 2d on the main beam 2a.

[0035] The main beam 2a is the main load-bearing structure of the maintenance gantry crane 2, used to connect the outrigger assemblies 2b on both sides and to support the maintenance equipment. The outrigger assemblies 2b are respectively located on both sides of the main beam 2a and can be laterally movably installed on the main beam 2a. The lower traveling mechanism 2c is located at the bottom of the outrigger assemblies 2b and cooperates with the lower traveling track 1c, enabling the maintenance gantry crane 2 to run along the extension direction of the navigation tunnel.

[0036] The track gauge adjustment mechanism is located between the main beam 2a and the outrigger assembly 2b. It is used to drive the outrigger assembly 2b to move along the width direction of the main beam 2a to adjust the distance between the two outrigger assemblies 2b, so that the maintenance gantry crane 2 can adapt to the track gauge corresponding to different sections.

[0037] The outrigger locking mechanism is located between the main beam 2a and the outrigger assembly 2b. It is used to lock the outrigger assembly 2b onto the main beam 2a after the outrigger assembly 2b moves to the target position, thereby ensuring the structural stability of the maintenance gantry crane 2 during operation.

[0038] The load-bearing support mechanism is set between the outrigger assembly 2b and the main beam 2a. It is used to establish a stable load-bearing path after the outrigger assembly 2b is positioned, so that the load borne by the outrigger assembly 2b can be directly transferred to the main structure of the main beam 2a, thus avoiding the track gauge adjustment mechanism from bearing the working load for a long time.

[0039] The auxiliary traveling mechanism 2d is located on the upper part of the main beam 2a and cooperates with the upper support structure 1d. The auxiliary traveling mechanism 2d includes an auxiliary traveling wheel set and a drive device. The auxiliary traveling wheel set can move along the upper support structure 1d. When the maintenance gantry crane 2 enters the track gauge change section or the turning section, the auxiliary traveling mechanism 2d can cooperate with the upper support structure 1d and support the entire maintenance gantry crane 2, causing the lower traveling mechanism 2c to disengage from the lower traveling track 1c, thereby releasing the track from the constraint of the outrigger assembly 2b and creating conditions for track gauge adjustment.

[0040] In some embodiments, the auxiliary walking mechanism 2d may also be provided with a steering connection structure, so that the auxiliary walking wheel set can generate steering motion relative to the main beam 2a to adapt to the operation requirements of the arc section.

[0041] To enable load switching between the auxiliary traveling mechanism 2d and the lower traveling mechanism 2c, a height transition structure 1e is provided between the upper support structure 1d and the lower traveling track 1c. The height transition structure 1e is used to change the relative distance between the upper support structure 1d and the lower traveling track 1c, allowing the maintenance gantry crane 2 to switch between the load-bearing state of the lower traveling mechanism 2c and the load-bearing state of the auxiliary traveling mechanism 2d.

[0042] In one embodiment, the height transition structure 1e includes a track ramp structure disposed on the lower walking track 1c; in another embodiment, the height transition structure 1e includes a support ramp structure disposed on the upper support structure 1d; in a further embodiment, the track ramp structure and the support ramp structure can be provided simultaneously to jointly complete the load-bearing switching process.

[0043] In addition, in other embodiments, the auxiliary walking mechanism 2d can also be configured with a lifting drive component, and the auxiliary walking mechanism 2d is driven by the lifting drive component to extend upward and abut against the upper support structure 1d, so as to lift the maintenance gantry 2 to a state where the lower walking mechanism 2c is separated from the lower walking track 1c, realizing the switching of the load-bearing path.

[0044] The control system is respectively connected to the gauge adjustment mechanism, the auxiliary walking mechanism 2d, the lower walking mechanism 2c, and the detection device, and is used to complete functions such as gauge detection, position detection, operation state monitoring, gauge adjustment control, load-bearing state switching control, and operation control. The control system can automatically control the maintenance gantry 2 to complete operations such as gauge conversion, curve running, and regular maintenance running according to preset line parameters or real-time detection data.

[0045] Through the coordinated cooperation among the upper support structure 1d, the auxiliary walking mechanism 2d, the gauge adjustment mechanism, the leg locking mechanism, and the lower walking mechanism 2c, the present invention constructs two operating states, namely a conventional track operating mode and an auxiliary support operating mode, on the same maintenance gantry 2. When the maintenance gantry 2 is in a conventional section, it is operated by the lower walking mechanism 2c along the lower walking track 1c; when the maintenance gantry 2 enters a gauge change section or an arc section, the auxiliary walking mechanism 2d forms a cooperation with the upper support structure 1d and bears the equipment load, and at the same time completes the position adjustment of the leg assembly 2b and the gauge adjustment, so as to realize the continuous operation of the maintenance gantry 2 between different gauge sections and curve sections.

[0046] II. Navigation tunnel structure The navigation tunnel structure in this embodiment is not only used to form a channel 1a space for ships to pass through, but also serves as a support foundation during the operation, gauge change, and turning processes of the maintenance gantry 2. Therefore, in addition to the conventional tunnel main body, the navigation tunnel structure also includes facilities such as a maintenance platform 1b, a lower walking track 1c, and an upper support structure 1d that are配套设置 with the maintenance gantry 2, and each part jointly constitutes an infrastructure system required for the operation of the maintenance gantry 2.

[0047] The navigation tunnel body 1 extends along a predetermined route, forming a waterway 1a for ship passage. Depending on actual engineering requirements, the overall route of the navigation tunnel may include different forms such as straight sections, circular arc sections, oblique sections, and gauge-changing sections. Gauge-changing sections mainly appear where the width of waterway 1a changes, such as the navigation tunnel entrance / exit areas, transition areas between different waterway grades 1a, or circular turning areas.

[0048] Inside the main body of the navigation tunnel 1, the channel 1a is located in the central area, and maintenance platforms 1b are set on both sides of the channel 1a. The maintenance platforms 1b are arranged continuously along the extension direction of the navigation tunnel. Lower travel tracks 1c are set on the maintenance platforms 1b on both sides. The two sets of lower travel tracks 1c are arranged along the extension direction of the navigation tunnel and cooperate with the lower travel mechanism 2c at the bottom of the maintenance gantry crane 2.

[0049] Within the straight sections of a navigation tunnel, the two sets of lower traveling tracks 1c can be arranged at a fixed distance. For example, in one embodiment, the track gauge between the two sets of lower traveling tracks 1c is 20m, thus meeting the normal operation requirements of the maintenance gantry crane 2. When the navigation tunnel enters a circular arc section, an oblique section, or a section where the width of the channel 1a changes, the distance between the maintenance platforms 1b on both sides changes accordingly due to the change in the width of the channel 1a, resulting in a change in the track gauge between the two sets of lower traveling tracks 1c. For example, in a circular arc section, to meet the turning requirements of ships, the width of the channel 1a will increase, and the corresponding track spacing will increase from 20m to 23m. Therefore, in this embodiment, the lower traveling tracks 1c do not always maintain a fixed track gauge, but can form different track gauge sections according to the actual cross-sectional dimensions and route of the navigation tunnel.

[0050] To enable continuous operation of the maintenance gantry crane 2 in sections with varying track gauge and circular arc sections, an upper support structure 1d is installed on the upper part of both side walls of the navigation tunnel. The upper support structure 1d is preferably installed in special areas such as circular arc sections, sections with varying track gauge, and oblique sections. It can be omitted in ordinary straight sections to reduce construction costs.

[0051] The upper support structure 1d preferably adopts a corbel structure. The corbel is continuously installed on the upper part of the sidewall along the extension direction of the navigation tunnel and protrudes into the channel 1a to form a load-bearing platform. The corbel can be formed by integral casting of reinforced concrete or by combining steel structure support beams with concrete structure.

[0052] Furthermore, the top of the supporting bracket can form a flat support surface, or it can be equipped with steel rails, track plates, wear-resistant guide rails, or other guiding structures to allow the auxiliary traveling mechanism 2d on the maintenance gantry crane 2 to operate. The arrangement height of the supporting bracket matches the installation height of the auxiliary traveling mechanism 2d of the maintenance gantry crane 2, so that the auxiliary traveling mechanism 2d can cooperate with the supporting bracket and bear the weight of the maintenance gantry crane 2.

[0053] In order to achieve load switching between the lower traveling mechanism 2c and the auxiliary traveling mechanism 2d, a height transition structure 1e is set between the upper support structure 1d and the lower traveling track 1c.

[0054] In one embodiment, the height transition structure 1e is formed by a track ramp structure. Specifically, before entering the gauge change section or the arc section, the lower traveling track 1c gradually slopes downward to form a track ramp, thereby gradually increasing the vertical distance between the lower traveling track 1c and the supporting bracket. When the maintenance gantry crane 2 enters this area, the auxiliary traveling mechanism 2d gradually contacts the supporting bracket and assumes the load, eventually causing the lower traveling mechanism 2c to disengage from the track.

[0055] In another embodiment, the height transition structure 1e is formed by a supporting ramp structure. Specifically, the supporting bracket gradually rises along the running direction to form a supporting ramp, thereby gradually increasing the vertical distance between the supporting bracket and the lower walking track 1c, thus realizing the contact between the auxiliary walking mechanism 2d and the supporting bracket and subsequent load switching.

[0056] In a further embodiment, the track approach slope structure and the supporting approach slope structure can be set up simultaneously, and the load-bearing switching can be completed through the joint action of the two to reduce the slope change required by a single structure and improve the smoothness of operation.

[0057] Through the above structural design, the main body of the navigation tunnel 1 not only provides passage space for ships, but also forms an operating infrastructure system that is compatible with the maintenance gantry crane 2, providing support for the normal operation, gauge adjustment and curved turning operation of the maintenance gantry crane 2.

[0058] III. Inspection of the main structure of gate operator 2 In this embodiment, the maintenance gantry crane 2 is a large-span portal structure spanning above the navigation tunnel channel 1a. It is used to carry various maintenance equipment and move longitudinally along the navigation tunnel to complete tasks such as tunnel structure inspection, equipment maintenance, dredging, removal of floating debris, and emergency repairs. Unlike traditional fixed-gauge maintenance gantry cranes 2, the maintenance gantry crane 2 in this embodiment not only has the operation and lifting functions of conventional maintenance equipment, but also has automatic gauge adjustment, auxiliary load-bearing operation, and the ability to pass through curved sections, thereby meeting the maintenance needs of complex-shaped navigation tunnels.

[0059] The maintenance gantry crane 2 includes a main beam 2a, a leg assembly 2b, a lower traveling mechanism 2c, a maintenance operation mechanism, and a connecting structure related to track gauge adjustment.

[0060] The main beam 2a is the main load-bearing structure of the maintenance gantry crane 2, spanning across the navigation tunnel channel 1a, with its two ends connected to corresponding outrigger assemblies 2b. The main beam 2a bears the loads of the maintenance equipment and the operational loads, and transfers these loads to the outrigger assemblies 2b on both sides. Depending on the project scale and load-bearing requirements, the main beam 2a can be a box girder structure, a truss beam structure, a box-truss composite beam structure, or other load-bearing structures suitable for large-span gantry cranes. The main beam 2a has an internal or top area for installing outrigger assemblies 2b and related adjustment mechanisms.

[0061] A maintenance trolley track can also be installed on the main beam 2a to allow the maintenance trolley to move along the length of the main beam 2a. The maintenance trolley can be configured with different functional modules according to actual operation needs. For example, hoisting mechanisms and hook devices, maintenance baskets, dredging equipment, testing equipment, lighting equipment, camera equipment, underwater detection equipment, or unmanned operation equipment, etc., to meet the needs of different maintenance tasks.

[0062] Outrigger assemblies 2b are located on the left and right sides of the main beam 2a to support the entire maintenance gantry crane 2. Unlike the traditional gantry crane where the outriggers are fixedly connected to the main beam 2a, the outrigger assembly 2b in this embodiment is movable.

[0063] Specifically, the outrigger assembly 2b is mounted on the main beam 2a via an outrigger moving trolley and can move along the width direction of the main beam 2a under the drive of the track gauge adjustment mechanism, thereby adjusting the distance between the two outrigger assemblies 2b. The upper end of the outrigger assembly 2b is connected to the outrigger moving trolley, and the lower end is connected to the lower traveling mechanism 2c.

[0064] To improve structural stability, a guide structure can be installed between the main beam 2a and the leg assembly 2b. The guide structure is used to restrain the lateral sway and longitudinal offset of the leg assembly 2b in its unadjusted state. The guide structure can be a guide wheel, guide slider, guide rail, or other guide and limiting structure.

[0065] The lower traveling mechanism 2c is located at the bottom of the outrigger assembly 2b and cooperates with the aforementioned lower traveling track 1c. The lower traveling mechanism 2c is used to support the entire maintenance gantry crane 2 under normal maintenance conditions and drive the maintenance gantry crane 2 to move longitudinally along the navigation tunnel.

[0066] The lower traveling mechanism 2c can adopt a wheel-rail structure. Specifically, the lower traveling mechanism 2c includes a traveling wheel set, a drive motor, a reducer, a brake, and a wheel axle assembly. The drive motor drives the traveling wheel set to rotate through the reducer, thereby enabling the maintenance gantry 2 to move along the track.

[0067] When the maintenance gantry crane 2 is in a normal straight section, the outrigger assemblies 2b on both sides remain locked. The weight of the entire machine is supported by the outrigger assemblies 2b and the lower traveling mechanism 2c, and the crane runs along the lower traveling track 1c. When the maintenance gantry crane 2 enters a track gauge change section or a circular arc section, the auxiliary traveling system (described later) takes over the load of the entire machine, and the track gauge adjustment system adjusts the position of the outrigger assemblies 2b to adapt the maintenance gantry crane 2 to the new track spacing requirements.

[0068] IV. Track Gauge Adjustment System The track gauge adjustment system is located between the main beam 2a and the outrigger assembly 2b. It is used to adjust the position of the outrigger assemblies 2b on both sides according to the track gauge changes between the lower traveling tracks 1c in different sections, thereby changing the overall track gauge of the maintenance gantry crane 2 and enabling the maintenance gantry crane 2 to adapt to the operation requirements corresponding to navigation tunnels of different widths.

[0069] The track gauge adjustment system mainly includes a lateral guide mechanism, a moving load-bearing mechanism, and an adjustment drive mechanism.

[0070] The lateral guide mechanism is mounted on the main beam 2a and extends along the width of the main beam 2a to provide lateral movement guidance for the outrigger assembly 2b. The lateral guide mechanism can be a guide rail, slide rail, guide beam, or other structural form capable of linear guidance.

[0071] A movable load-bearing mechanism is positioned between the upper end of the outrigger assembly 2b and the main beam 2a, and cooperates with the lateral guide mechanism. The movable load-bearing mechanism supports the weight of the outrigger assembly 2b while enabling the outrigger assembly 2b to move along the lateral guide mechanism. The movable load-bearing mechanism can employ a trolley structure, comprising a frame and a set of wheels mounted on the frame, the wheels engaging in rolling contact with the lateral guide mechanism.

[0072] The adjustment drive mechanism is used to drive the moving load-bearing mechanism to move along the lateral guide mechanism, thereby adjusting the position of the outrigger assembly 2b. The adjustment drive mechanism can be in the form of a gear and rack drive mechanism, a screw and nut drive mechanism, a sprocket and chain drive mechanism, a wire rope traction mechanism, an electric push rod mechanism, or a hydraulic drive mechanism, etc.

[0073] Preferably, the adjustment drive mechanism adopts a rack and pinion drive structure. A rack is fixedly installed on the main beam 2a, and a drive motor, a reducer, and a drive gear are installed on the moving load-bearing mechanism. When the drive motor is working, the drive gear moves along the rack, thereby driving the outrigger assembly 2b to move towards the inside or outside of the main beam 2a.

[0074] To ensure synchronized adjustment of the two outrigger assemblies 2b, the adjustment drive mechanism can adopt either an independent drive or a linkage drive. In the linkage drive mode, the two outrigger assemblies 2b can achieve synchronized movement through a drive shaft, a synchronous chain, or an electronic synchronization control system, thereby avoiding excessive positional deviation of the two outrigger assemblies 2b that would affect the overall stability of the machine.

[0075] Furthermore, multiple preset positioning positions can be set on the transverse guide mechanism, each corresponding to a different track gauge specification. When the maintenance gantry crane 2 runs to the track gauge change section, the control system controls and adjusts the drive mechanism according to the track gauge parameters corresponding to the target section, so that the two side support leg assemblies 2b move to the corresponding positioning positions.

[0076] V. Outrigger Locking System The outrigger locking system is located between the main beam 2a and the outrigger assembly 2b, and is used to position and lock the outrigger assembly 2b after the track gauge adjustment is completed.

[0077] Since the outrigger assembly 2b in this embodiment is installed in a movable manner, if the track gauge adjustment system is used to maintain it after the outrigger assembly 2b moves to the target track gauge position, the operating load will act on the moving bearing mechanism and the adjustment drive mechanism for a long time, which is not conducive to the long-term stable operation of the equipment. Therefore, this embodiment is equipped with a special outrigger locking system, which re-fixes the outrigger assembly 2b to the main beam 2a after the track gauge adjustment is completed, so that the maintenance gantry crane 2 is restored to a rigid gantry structure.

[0078] The outrigger locking system mainly includes a positioning mechanism, a locking mechanism, and a load-bearing support mechanism.

[0079] The positioning mechanism is used to determine the final installation position of the outrigger assembly 2b. The positioning mechanism can employ positioning holes, positioning slots, positioning blocks, positioning pins, or other mechanical positioning structures. Multiple positioning positions can be set on the main beam 2a along the outrigger's movement direction, each corresponding to a different track gauge. After the outrigger assembly 2b moves to the target position, the positioning mechanism first completes position calibration, providing a basis for subsequent locking.

[0080] The locking mechanism is used to reliably connect the outrigger assembly 2b to the main beam 2a, preventing lateral movement of the outrigger assembly 2b during operation. The locking mechanism can adopt a mechanical locking pin structure, a hydraulic locking pin structure, a wedge locking structure, a clamping locking structure, or other structural forms that can achieve rigid locking.

[0081] Preferably, the locking mechanism adopts a hydraulic locking pin structure. After the outrigger assembly 2b moves to the target position, the hydraulic actuator drives the locking pin to extend, causing the locking pin to insert into the corresponding positioning hole, thereby forming a rigid connection between the main beam 2a and the outrigger assembly 2b. To improve the connection reliability, the locking mechanism can be arranged symmetrically on both sides or in a multi-point arrangement, so that the locking load is distributed to multiple connection positions, thereby improving the overall connection strength.

[0082] To prevent the operating load from acting on the mobile load-bearing mechanism for a long time, this embodiment also includes a load-bearing support mechanism. The load-bearing support mechanism is located between the main beam 2a and the mobile load-bearing mechanism. Its function is to establish an independent load transfer path after the track gauge adjustment and locking are completed, so that the load borne by the outrigger assembly 2b is directly transferred to the main structure of the main beam 2a.

[0083] The load-bearing support mechanism can adopt a support block structure, a lifting support structure, a wedge support structure, or a telescopic support structure.

[0084] Preferably, the load-bearing support mechanism adopts a retractable support block structure. The support block is located below or to the side of the movable load-bearing mechanism, and extends outward after the outrigger assembly 2b is positioned to form a supporting fit with the main beam 2a.

[0085] At this time, the vertical load borne by the outrigger assembly 2b is directly transmitted to the main beam 2a through the support block, while the moving load-bearing mechanism only undertakes the guiding function and no longer undertakes the main working load.

[0086] To ensure the safety and reliability of the locked state, the outrigger locking system can also be equipped with a locking state detection device. This device detects whether the locking pin is fully inserted, whether the support block is fully extended, and whether the outrigger assembly 2b has reached a preset position. Only when the detection results meet the set conditions will the control system allow the maintenance gate operator 2 to enter the operating state.

[0087] When the maintenance gantry crane 2 needs to be adjusted again, the control system first releases the locking mechanism and the load-bearing support mechanism, so that the outrigger assembly 2b can be moved again. Then, the track gauge adjustment system drives the outrigger assembly 2b to move to the new target position and reposition and lock it.

[0088] VI. Assisted Walking System In this embodiment, the auxiliary walking system is installed on the upper part of the maintenance gantry crane 2. It is used to bear all or part of the weight of the maintenance gantry crane 2 during the track gauge adjustment stage or the curved operation stage, and to move along the upper support structure 1d set on the side wall of the navigation tunnel, thereby realizing the load switching, track gauge adjustment and turning operation functions of the maintenance gantry crane 2.

[0089] The auxiliary walking system mainly includes the auxiliary walking mechanism 2d, the steering mechanism, and the drive mechanism.

[0090] In one embodiment, an auxiliary traveling mechanism 2d is provided at each of the left and right ends of the main beam 2a. In another preferred embodiment, an auxiliary traveling mechanism 2d is provided at each of the four corners of the main beam 2a. This forms a four-point support structure, which has better stability and anti-overturning ability when bearing the weight of the entire machine.

[0091] The auxiliary walking mechanism 2d mainly includes a mounting bracket, auxiliary walking wheel set, and wheel and axle assembly.

[0092] The auxiliary traveling wheel assembly rolls in conjunction with the upper support structure 1d to bear the load of the maintenance gantry crane 2 and move along the upper support structure 1d. The auxiliary traveling wheel assembly can use steel wheels, rubber-coated wheels, or other wheel assembly structures suitable for heavy-duty operation.

[0093] The drive mechanism is used to move the auxiliary walking wheel set. The drive mechanism can be driven by a motor, hydraulically, or other drive methods suitable for heavy-duty walking equipment. Preferably, the drive mechanism adopts a combination structure of a variable frequency motor and a reducer. The reducer drives the auxiliary walking wheel set to rotate, thereby driving the maintenance gantry crane 2 to run along the upper support structure 1d.

[0094] The control system can control the running speed and running status of each auxiliary walking mechanism 2d separately.

[0095] In the straight sections of the navigation tunnel, the auxiliary travel system is usually in standby mode and does not bear the main load. When the maintenance gantry crane 2 enters the track gauge change section or the arc section, the auxiliary travel system gradually establishes a support relationship with the upper support structure 1d and bears the weight of the maintenance gantry crane 2, causing the lower travel mechanism 2c to detach from the lower travel track 1c.

[0096] The auxiliary walking system in this embodiment also has steering capability. To adapt to the operating requirements of the arc section, a steering mechanism can be installed between the auxiliary walking mechanism 2d and the main beam 2a. The steering mechanism can adopt a slewing bearing structure, bogie structure, articulated connection structure, or other structural forms that can achieve angle adjustment. Through the steering mechanism, the auxiliary walking wheel set can automatically adjust its running direction according to the extension direction of the upper support structure 1d, so that the auxiliary walking wheel set always runs along the trajectory corresponding to the support bracket.

[0097] When the maintenance gantry crane 2 enters the arc section, the auxiliary traveling mechanism 2d located on the outer side of the arc travels a greater distance than the auxiliary traveling mechanism 2d located on the inner side due to the different operating radii of the inner and outer sides of the arc. At this time, the control system performs differential speed control on the left and right auxiliary traveling mechanisms 2d based on preset curve parameters or real-time detection data, ensuring that the operating speed of the outer auxiliary traveling mechanism 2d is greater than that of the inner auxiliary traveling mechanism 2d, thereby driving the entire maintenance gantry crane 2 to smoothly turn along the arc path.

[0098] In some embodiments, the auxiliary walking system can also be used as an active jacking system. Specifically, a lifting drive assembly is provided between the auxiliary walking mechanism 2d and the main beam 2a. The lifting drive assembly can be a hydraulic cylinder, an electric push rod, a screw jack, or other jacking mechanism.

[0099] When the maintenance gantry crane 2 enters the area requiring track gauge adjustment, the lifting drive assembly drives the auxiliary traveling mechanism 2d to extend outward, causing the auxiliary traveling wheels to contact the upper support structure 1d and continuously apply a lifting force. This gradually transfers the weight of the maintenance gantry crane 2 to the auxiliary traveling system, ultimately causing the lower traveling mechanism 2c to disengage from the lower traveling track 1c. After the track gauge adjustment is completed, the lifting drive assembly reverses its movement, causing the maintenance gantry crane 2 to be supported again by the lower traveling mechanism 2c.

[0100] When adopting the slope transition switching scheme, the auxiliary walking system does not need to be equipped with an active jacking function, but instead automatically completes the load switching through the aforementioned height transition structure 1e.

[0101] Both of the above methods can achieve load-bearing conversion between the auxiliary walking system and the lower walking system, and the present invention does not limit this.

[0102] VII. Bearer Switching System The load switching system in this embodiment is used to realize the load transfer between the lower traveling mechanism 2c and the auxiliary traveling system during the operation of the maintenance gantry crane 2, so that the maintenance gantry crane 2 can switch smoothly between different support paths, thereby completing the track gauge adjustment, passing through curved sections and switching between different operating modes.

[0103] The core function of the load switching system is to gradually release the load relationship between the lower traveling mechanism 2c and the lower traveling track 1c when the maintenance gantry crane 2 switches from the conventional track operation state to the track gauge adjustment state or the turning operation state, while establishing the load relationship between the auxiliary traveling mechanism 2d and the upper support structure 1d, and realizing reverse restoration after the operation is completed.

[0104] In this embodiment, the load switching system mainly relies on the change in the height relationship between the upper support structure 1d and the lower traveling track 1c, specifically including the height transition structure 1e and the corresponding operation control strategy.

[0105] The height transition structure 1e is used to change the relative height relationship between the upper support structure 1d and the lower traveling track 1c, so that the maintenance gantry crane 2 can gradually complete the load transfer during operation. The height transition structure 1e can be set on the side of the lower traveling track 1c, on the side of the upper support structure 1d, or both.

[0106] In one embodiment, the height transition structure 1e is installed on the lower traveling track 1c in the form of a track ramp, so that the lower traveling track 1c gradually decreases in the running direction, thereby causing the auxiliary traveling mechanism 2d to gradually approach and contact the upper support structure 1d. After the lower traveling track 1c continues to descend to a preset height, the lower traveling mechanism 2c gradually disengages from the track, and all loads are transferred to the auxiliary traveling mechanism 2d.

[0107] In another embodiment, the height transition structure 1e is set on the upper support structure 1d in the form of a support ramp, so that the upper support structure 1d gradually rises along the running direction, thereby gradually contacting the auxiliary walking mechanism 2d and bearing the load.

[0108] In a further embodiment, the two types of slope structures mentioned above can be set up simultaneously. By changing the slope relative to the top and bottom, the slope change of one side structure can be reduced, thereby improving the smoothness of the load switching process.

[0109] In other embodiments, the load switching system may also include an active lifting switching structure.

[0110] The active lifting switching structure includes a lifting drive component mounted on the auxiliary walking mechanism 2d. The lifting drive component can be a hydraulic cylinder, an electric push rod, or a screw lifting mechanism.

[0111] When the maintenance gantry crane 2 enters the track gauge change section, the lifting drive assembly drives the auxiliary walking mechanism 2d to move upward, so that the auxiliary walking wheel group gradually contacts the upper support structure 1d and applies a lifting force until it fully bears the weight of the maintenance gantry crane 2, thereby causing the lower walking mechanism 2c to disengage from the lower walking track 1c and realize the switching of the load-bearing path.

[0112] When the maintenance gantry crane 2 completes the track gauge adjustment or passes through the curved section, the lifting drive component reverses its action, gradually transferring the load back to the lower traveling mechanism 2c, thus achieving a recovery switch.

[0113] VIII. Control System The control system in this embodiment is used to coordinate and control the maintenance gantry crane 2 and related operating equipment in the navigation tunnel, so as to realize the automated management of processes such as track gauge adjustment, load switching, travel operation and turning operation.

[0114] The control system is electrically connected to the lower traveling mechanism 2c, the auxiliary traveling mechanism 2d, the track gauge adjustment system, and the load switching system, and controls each actuator according to preset operating parameters or real-time detection data.

[0115] The control system mainly includes a central control unit, a signal acquisition unit, and an execution control unit.

[0116] The signal acquisition unit is used to collect the operating status information of the maintenance gantry crane 2, including position parameters, operating speed parameters, load parameters, track gauge parameters, and outrigger position parameters. This information can be obtained through position sensors, displacement sensors, track gauge detection sensors, and load sensors installed on the maintenance gantry crane 2.

[0117] The central control unit is used to analyze and process the collected signals and generate control commands according to the operational requirements of different sections of the navigation tunnel.

[0118] The execution control unit is used to drive the lower traveling mechanism 2c, the auxiliary traveling mechanism 2d, the track gauge adjustment mechanism, and the load switching mechanism to perform corresponding actions according to the control commands output by the central control unit.

[0119] When the maintenance gate operator 2 is in normal linear operation, the control system controls the lower traveling mechanism 2c to run along the lower traveling track 1c, while the auxiliary traveling mechanism 2d is in standby mode.

[0120] When the maintenance gantry crane 2 enters the track gauge change section or the curve section, the control system sequentially controls the load switching system to start, so that the auxiliary traveling mechanism 2d takes over the load; then controls the track gauge adjustment system to make lateral adjustment to the outrigger assembly 2b; after the adjustment is completed, controls the outrigger locking system to lock; finally, it returns to the load-bearing operation state of the lower traveling mechanism 2c.

[0121] During operation in the arc section, the control system further performs differential speed control on the left and right auxiliary walking mechanisms 2d to achieve the turning operation of the maintenance gantry crane 2.

[0122] IX. Work Process The working process of the adaptive variable gauge system for navigation tunnel maintenance in this embodiment is as follows.

[0123] In the straight sections of the navigation tunnel, the lower traveling tracks 1c on both sides maintain a fixed gauge. The maintenance gantry crane 2 is directly supported by the lower traveling mechanism 2c and runs normally along the tracks. At this time, the auxiliary traveling system is in standby mode, the gauge adjustment system is in locked mode, and the outrigger assembly 2b maintains the preset gauge and is fixed by the outrigger locking system. The entire system completes tunnel maintenance operations in the manner of a conventional gantry crane.

[0124] When the maintenance gantry crane 2 reaches the transition area before the track gauge change section or the arc section, the control system first activates the load switching system. The auxiliary traveling mechanism 2d gradually contacts the upper support structure 1d and assumes part or all of the load of the maintenance gantry crane 2, causing the lower traveling mechanism 2c to gradually unload and detach from the lower traveling track 1c, thereby providing operating conditions for subsequent track gauge adjustment.

[0125] After the load-bearing path switch is completed, the track gauge adjustment system is activated. The track gauge adjustment system drives the outrigger assemblies 2b on both sides to move laterally along the main beam 2a, adjusting the outrigger spacing to match the target track gauge that matches the current section's lower traveling track 1c. During this process, the outrigger movement is completed by the cooperation of the moving load-bearing mechanism and the lateral guiding mechanism, ensuring the stability and controllability of the adjustment process.

[0126] Once the outrigger assembly 2b has moved to the target position, the outrigger locking system activates. The positioning mechanism first completes the alignment, then the locking mechanism rigidly connects the outrigger assembly 2b to the main beam 2a. Simultaneously, the load-bearing support mechanism establishes the final load-bearing path, causing the outrigger assembly 2b to enter the working locked state. At this point, the track gauge adjustment process is complete.

[0127] Subsequently, the maintenance gantry crane 2 continues to operate to the end of the transition section. During this process, the load switching system reverses its operation, causing the auxiliary traveling mechanism 2d to gradually unload and detach from the upper support structure 1d, while the lower traveling mechanism 2c re-engages with the lower traveling track 1c and resumes load-bearing, thereby completing the switching of the operating support path.

[0128] During operation in the arc section, the auxiliary traveling mechanism 2d maintains a coordinated state with the upper support structure 1d. The control system performs differential speed control on the auxiliary traveling mechanism 2d based on the difference in the running paths on the left and right sides, ensuring that the outer auxiliary traveling mechanism 2d runs at a higher speed than the inner auxiliary traveling mechanism 2d, thereby driving the maintenance gantry crane 2 to smoothly turn and run along the arc line. Simultaneously, according to the changes in track gauge within the arc section, the track gauge adjustment system can adjust the leg spacing synchronously or in stages to adapt to structural changes in different sections.

[0129] After passing through the arc section or the track gauge change section, the system repeats the above-mentioned load switching, track gauge adjustment and locking process to restore the maintenance gantry crane 2 to the straight section operation state and continue to complete the subsequent maintenance work along the lower travel track 1c.

[0130] Through the above working process, the maintenance gantry crane 2 in this embodiment can achieve continuous passage between straight sections, track gauge change sections and circular arc sections without disassembly or overall transfer, and complete maintenance operations within the entire navigable tunnel range, demonstrating high adaptability and operational continuity.

[0131] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0132] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0133] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. An adaptive variable gauge system for maintenance of navigation tunnels, characterized in that, include: The navigation tunnel body (1) forms a waterway (1a) for ships to pass through inside the navigation tunnel body (1), and maintenance platforms (1b) are set on both sides of the waterway (1a). Two sets of lower travel tracks (1c) are respectively installed on the maintenance platform (1b); The maintenance gantry crane (2) is spanned above the waterway (1a) and includes a main beam (2a), outrigger assemblies (2b) arranged on both sides of the main beam (2a), and a lower traveling mechanism (2c) that cooperates with the outrigger assemblies (2b). The lower traveling mechanism (2c) cooperates with the lower traveling track (1c) to drive the maintenance gantry crane (2) to move along the extension direction of the navigation tunnel. The outrigger assemblies (2b) are movably mounted on the main beam (2a). The main beam (2a) is provided with a track gauge adjustment mechanism for driving the outrigger assemblies (2b) to move along the width direction of the main beam (2a) to adjust the distance between the two sets of outrigger assemblies (2b). The upper part of the side wall of the main body of the navigation tunnel (1) is provided with an upper support structure (1d), and the upper part of the maintenance gantry crane (2) is provided with an auxiliary walking mechanism (2d) that cooperates with the upper support structure (1d). The auxiliary walking mechanism (2d) is configured to cooperate with the upper support structure (1d) and carry the maintenance gantry crane (2) during the track gauge adjustment process, so that the lower walking mechanism (2c) is disengaged from the lower walking track (1c) to allow the outrigger assembly (2b) to be positioned. The track gauge adjustment mechanism is used to adjust the position of the outrigger assembly (2b) on the main beam (2a), so that the maintenance gantry crane (2) can adapt to the operating requirements of different track gauge sections.

2. The adaptive variable gauge system for navigation tunnel maintenance according to claim 1, characterized in that: The upper support structure (1d) is set in at least one of the arc section, skew section, and gauge change section of the navigation tunnel, and is continuously arranged along the extension direction of the corresponding area.

3. The adaptive gauge system for navigation tunnel maintenance according to claim 1, characterized in that: The upper support structure (1d) includes support brackets set on the upper part of the side walls on both sides of the navigation tunnel, and the support brackets form a support surface or guide track for the auxiliary walking mechanism (2d) to walk.

4. The adaptive variable gauge system for navigation tunnel maintenance according to claim 1, characterized in that: The auxiliary walking mechanism (2d) includes auxiliary walking wheel sets disposed at both ends of the main beam (2a). The auxiliary walking wheel sets are connected to the drive device to drive the maintenance gate machine (2) to move along the upper support structure (1d). The auxiliary walking wheel set can be rotated relative to the main beam (2a) to adapt to changes in the direction of travel in the arc segment or turning segment.

5. The adaptive variable gauge system for navigation tunnel maintenance according to claim 1, characterized in that: The track gauge adjustment mechanism includes a transverse track and a support leg moving trolley set on the transverse track. The support leg assembly (2b) is mounted on the support leg moving trolley, and the support leg moving trolley moves along the transverse track to drive the support leg assembly (2b) to adjust its position. The track gauge adjustment mechanism also includes a drive assembly, which is one of a gear and rack mechanism, a lead screw and nut mechanism, a chain drive mechanism, or a hydraulic drive mechanism.

6. The adaptive variable gauge system for maintenance of navigation tunnels according to claim 5, characterized in that: The main beam (2a) is provided with a leg locking mechanism. After the leg assembly (2b) moves to the target gauge position, the leg locking mechanism locks the leg assembly (2b) onto the main beam (2a). The outrigger locking mechanism includes one of a locking pin assembly, a wedge block assembly, a hydraulic locking assembly, or a mechanical clamping assembly.

7. The adaptive variable gauge system for navigation tunnel maintenance according to claim 5, characterized in that: The outrigger trolley is equipped with a load-bearing support mechanism. After the outrigger assembly (2b) is positioned, the load-bearing support mechanism extends and forms a support cooperation with the main beam (2a) to transfer the load borne by the outrigger assembly (2b) to the main beam (2a) and reduce the load on the outrigger trolley's wheels.

8. The adaptive gauge system for maintenance of navigation tunnels according to claim 1, characterized in that: The auxiliary walking mechanism (2d) is provided with a lifting drive component. The lifting drive component drives the auxiliary walking mechanism (2d) to extend upward and abut against the upper support structure (1d) so as to lift the maintenance gate machine (2) to the state where the lower walking mechanism (2c) is disengaged from the lower walking track (1c).

9. The adaptive variable gauge system for navigation tunnel maintenance according to claim 1, characterized in that: A height transition structure (1e) is provided between the upper support structure (1d) and the lower walking track (1c). The height transition structure (1e) is used to change the distance between the upper support structure (1d) and the lower walking track (1c) so as to realize the switching of the maintenance gate machine (2) between the lower walking mechanism (2c) load state and the auxiliary walking mechanism (2d) load state. The height transition structure (1e) includes a track ramp structure set on the lower running track (1c) and / or a support ramp structure set on the upper support structure (1d).

10. The adaptive variable gauge system for navigation tunnel maintenance according to claim 1, characterized in that: The system also includes a control system, which is connected to the track gauge adjustment mechanism, the auxiliary walking mechanism (2d) and the lower walking mechanism (2c), and is used to control the position adjustment of the outrigger assembly (2b), the switching of the load-bearing state and the operation of the maintenance gantry crane (2).

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